Effect of endogenous chloride contamination on the electrochemical and hydration responses of reinforced Belite-Ye'elimite-Ferrite (BYF) cement mortars

Guilherme Yuuki Koga; Paul Comperat; Blandine Albert; Virginie Roche; Ricardo Pereira Nogueira

doi:10.1016/j.cemconres.2019.04.022

Effect of endogenous chloride contamination on the electrochemical and hydration responses of reinforced Belite-Ye'elimite-Ferrite (BYF) cement mortars

Guilherme Yuuki Koga, Paul Comperat, Blandine Albert, Virginie Roche, Ricardo Pereira Nogueira

Chemical and Petroleum Engineering

Research output: Contribution to journal › Article › peer-review

19 Scopus citations

Abstract

Carbon steel rebars passivate in Belite-Ye'elimite-Ferrite mortars, despite the initial low pH of the pore solution compared to Portland equivalents. Besides passivation ability, another important durability issue is the maximum allowed chloride content in the fresh mix beyond which passivation is prevented, normally 0.4% of chloride by cement mass for reinforced Portland concretes. This work aims to evaluate the impact of different endogenous chloride contents on the evolution of the electrochemical and physicochemical responses of reinforced mortars and neat cement pastes. It is shown that steel in BYF mortars contaminated with up to 0.4% of chlorides effectively passivate but the time needed to passivation is longer than for OPC mortars. Sodium chloride contamination was also found to retard the BYF hydration due to a delayed belite and ferrite hydration. Results showed that higher w/c ratio decreases the tolerable chloride content from 0.4%, BYF (w/c = 0.50) to 0.2%, BYF (w/c = 0.67).

Original language	British English
Pages (from-to)	212-226
Number of pages	15
Journal	Cement and Concrete Research
Volume	122
DOIs	https://doi.org/10.1016/j.cemconres.2019.04.022
State	Published - Aug 2019

Keywords

Chloride
Corrosion
Mild steel
Steel reinforced concrete
Sulfoaluminate cement

Access to Document

10.1016/j.cemconres.2019.04.022

Cite this

@article{6fc55e477a66484fae51ff9ca10369d4,

title = "Effect of endogenous chloride contamination on the electrochemical and hydration responses of reinforced Belite-Ye'elimite-Ferrite (BYF) cement mortars",

abstract = "Carbon steel rebars passivate in Belite-Ye'elimite-Ferrite mortars, despite the initial low pH of the pore solution compared to Portland equivalents. Besides passivation ability, another important durability issue is the maximum allowed chloride content in the fresh mix beyond which passivation is prevented, normally 0.4% of chloride by cement mass for reinforced Portland concretes. This work aims to evaluate the impact of different endogenous chloride contents on the evolution of the electrochemical and physicochemical responses of reinforced mortars and neat cement pastes. It is shown that steel in BYF mortars contaminated with up to 0.4% of chlorides effectively passivate but the time needed to passivation is longer than for OPC mortars. Sodium chloride contamination was also found to retard the BYF hydration due to a delayed belite and ferrite hydration. Results showed that higher w/c ratio decreases the tolerable chloride content from 0.4%, BYF (w/c = 0.50) to 0.2%, BYF (w/c = 0.67).",

keywords = "Chloride, Corrosion, Mild steel, Steel reinforced concrete, Sulfoaluminate cement",

author = "Koga, {Guilherme Yuuki} and Paul Comperat and Blandine Albert and Virginie Roche and Nogueira, {Ricardo Pereira}",

note = "Funding Information: The authors gratefully acknowledge the financial support of the Brazilian institution CNPq (grant number 229886/2013-2 ), of the French institution ANRT (grant number 2013/1440 ), and of the LafargeHolcim Group . Funding Information: The authors gratefully acknowledge the financial support of the Brazilian institution CNPq (grant number 229886/2013-2), of the French institution ANRT (grant number 2013/1440), and of the LafargeHolcim Group. Publisher Copyright: {\textcopyright} 2019 Elsevier Ltd",

year = "2019",

month = aug,

doi = "10.1016/j.cemconres.2019.04.022",

language = "British English",

volume = "122",

pages = "212--226",

journal = "Cement and Concrete Research",

issn = "0008-8846",

publisher = "Elsevier Ltd",

}

TY - JOUR

T1 - Effect of endogenous chloride contamination on the electrochemical and hydration responses of reinforced Belite-Ye'elimite-Ferrite (BYF) cement mortars

AU - Koga, Guilherme Yuuki

AU - Comperat, Paul

AU - Albert, Blandine

AU - Roche, Virginie

AU - Nogueira, Ricardo Pereira

N1 - Funding Information: The authors gratefully acknowledge the financial support of the Brazilian institution CNPq (grant number 229886/2013-2 ), of the French institution ANRT (grant number 2013/1440 ), and of the LafargeHolcim Group . Funding Information: The authors gratefully acknowledge the financial support of the Brazilian institution CNPq (grant number 229886/2013-2), of the French institution ANRT (grant number 2013/1440), and of the LafargeHolcim Group. Publisher Copyright: © 2019 Elsevier Ltd

PY - 2019/8

Y1 - 2019/8

N2 - Carbon steel rebars passivate in Belite-Ye'elimite-Ferrite mortars, despite the initial low pH of the pore solution compared to Portland equivalents. Besides passivation ability, another important durability issue is the maximum allowed chloride content in the fresh mix beyond which passivation is prevented, normally 0.4% of chloride by cement mass for reinforced Portland concretes. This work aims to evaluate the impact of different endogenous chloride contents on the evolution of the electrochemical and physicochemical responses of reinforced mortars and neat cement pastes. It is shown that steel in BYF mortars contaminated with up to 0.4% of chlorides effectively passivate but the time needed to passivation is longer than for OPC mortars. Sodium chloride contamination was also found to retard the BYF hydration due to a delayed belite and ferrite hydration. Results showed that higher w/c ratio decreases the tolerable chloride content from 0.4%, BYF (w/c = 0.50) to 0.2%, BYF (w/c = 0.67).

AB - Carbon steel rebars passivate in Belite-Ye'elimite-Ferrite mortars, despite the initial low pH of the pore solution compared to Portland equivalents. Besides passivation ability, another important durability issue is the maximum allowed chloride content in the fresh mix beyond which passivation is prevented, normally 0.4% of chloride by cement mass for reinforced Portland concretes. This work aims to evaluate the impact of different endogenous chloride contents on the evolution of the electrochemical and physicochemical responses of reinforced mortars and neat cement pastes. It is shown that steel in BYF mortars contaminated with up to 0.4% of chlorides effectively passivate but the time needed to passivation is longer than for OPC mortars. Sodium chloride contamination was also found to retard the BYF hydration due to a delayed belite and ferrite hydration. Results showed that higher w/c ratio decreases the tolerable chloride content from 0.4%, BYF (w/c = 0.50) to 0.2%, BYF (w/c = 0.67).

KW - Chloride

KW - Corrosion

KW - Mild steel

KW - Steel reinforced concrete

KW - Sulfoaluminate cement

UR - http://www.scopus.com/inward/record.url?scp=85065773496&partnerID=8YFLogxK

U2 - 10.1016/j.cemconres.2019.04.022

DO - 10.1016/j.cemconres.2019.04.022

M3 - Article

AN - SCOPUS:85065773496

SN - 0008-8846

VL - 122

SP - 212

EP - 226

JO - Cement and Concrete Research

JF - Cement and Concrete Research

ER -

Effect of endogenous chloride contamination on the electrochemical and hydration responses of reinforced Belite-Ye'elimite-Ferrite (BYF) cement mortars

Abstract

Keywords

Access to Document

Other files and links

Fingerprint

Cite this